# Shooting for the STAAR

```Shooting for the STAAR
Tuesday, January 17, 2012
1. The hydra shown below is reproducing
asexually.
What percentage of the offspring’s genetic
information is the same as the genetic
information of the parent? Record your answer
on grid 1.
7.14B Supporting Standard
100%
Organisms that reproduce asexually involve
only one parent and all offspring will be
genetically identical to the parent.
Wednesday, January 18, 2012
A woman working out at the gym holds a 200
N weight stationary 0.7 m over her head for
10 seconds. How many of work does she do
on the weight in those 10 seconds?
TEKS 7.7A Supporting Standard
The woman does no work during the ten
seconds she is holding the weight over her
Work (J) = Force (N) x distance (m)
Thursday, January 19, 2012
A bicyclist travels 40 km in 2 hours. What
would the total distance traveled in km if the
cyclist rides for another 3 hours at the same
rate?
TEKS 6.8C Supporting Standard
100 km
If the bicyclist travels 40 km in 2 hours then
the rate is 20 km per hour. If the cyclist rides
for another 3 hours (a total of 5 hours) at 20
km per hour then the total distance traveled
will be 100 km.
Friday, January 20, 2012
The density of an object depends on two
properties: the object’s mass and the object’s
volume. The following equation shows how
density (d) is related to mass (m) and volume (v):
Density = _mass__
volume
Aluminum has an average density of 2.7 g/cm3.
What is the mass of a solid aluminum block with
a volume of 30 cm3?
TEKS 6.6B Supporting Standard
Using the density formula d = m/v
2.7 g/cm3 = ? / 30 cm3
m = d x v = 2.7 g/cm3 x 30 cm3
m = 81 g
Tuesday, January 24, 2012
Why might you use a food web, rather than a
food chain, to show how organisms in an
ecosystem are related?
Reporting Category 1 TEKS 7.5 C Supporting Standard
A food web shows that an organism can have
more than one food source in an ecosystem.
Wednesday, January 25, 2012
How much work in Joules is required to lift the
weight vertically 1 m to the top of the ramp?
Record your answer on the grid provided.
Reporting Category 2 TEKS 7.7 A Supporting Standard
Work (Joules) = Force (Newton) x Distance (meters)
The weight is to be lifted vertically; therefore, the
distance moved is 1 meter.
W (Joules) = 100 N x 1 m
Work = 100 N • n = 100 J
Thursday, January 26, 2012
Use the illustration below to explain how tides
are caused.
Reporting Category 3 TEKS 8.7 C Supporting Standard
The Moon’s gravity causes the oceans to
bulge on the side of Earth closest to the Moon
(label A). At the same time, gravity is also
pulling Earth toward the Moon, leaving behind
the ocean on the opposite side (label B).
When this occurs, high tides are generated.
Areas that are neither toward nor away from
the Moon have low tides (labels C and D).
Friday, January 27, 2012
Ecosystems are constantly being changed by the interaction of
living and nonliving things. Through this constant change they
remain balanced. Which example is likely to be permanent
and disturb this natural balance of an ecosystem?
A. In a forest, trees die and are replaced by new trees.
B. A new canal is dug to control the flow of water in and out
of an area.
C. Seasonal changes occur in the oxygen level of water in a
lake.
D. Seasonal changes occur in the hydrogen level of water in
a lake.